U.S. patent number 9,857,535 [Application Number 15/096,171] was granted by the patent office on 2018-01-02 for method of packaging multichannel optical receiver module having a sub-mount with an optical block to guide incident parallel light beams and package of the same.
This patent grant is currently assigned to ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE. The grantee listed for this patent is ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE. Invention is credited to Young Soon Heo, Hyun Seo Kang, Jeong Eun Kim, Keo Sik Kim, Hyoung Jun Park, Ji Hyoung Ryu.
United States Patent |
9,857,535 |
Heo , et al. |
January 2, 2018 |
Method of packaging multichannel optical receiver module having a
sub-mount with an optical block to guide incident parallel light
beams and package of the same
Abstract
A method of packaging a multi-channel optical receiver module
and a package of the same are provided. The method includes
installing a first lens on a sub-mount; aligning an optical block
including a plurality of filters on the sub-mount; installing the
aligned optical block on the sub-mount; aligning a second lens on
the sub-mount; installing the aligned second lens on the sub-mount;
and coupling the sub-mount to a TO-stem. The aligning of the
optical block transmits light incident through the first lens to
the plurality of filters, transmits light beams transmitted through
the plurality of filters to an object lens, monitors positions of
and intervals between the light beams transmitted through an
infrared (IR) camera and aligns the optical block so that the
intervals between the light beams transmitted through the plurality
of filters are identical.
Inventors: |
Heo; Young Soon (Gwangju,
KR), Kang; Hyun Seo (Gwangju, KR), Kim; Keo
Sik (Gwangju, KR), Kim; Jeong Eun (Gwangju,
KR), Ryu; Ji Hyoung (Jeonju, KR), Park;
Hyoung Jun (Gwangju, KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE |
Daejeon |
N/A |
KR |
|
|
Assignee: |
ELECTRONICS AND TELECOMMUNICATIONS
RESEARCH INSTITUTE (Daejeon, KR)
|
Family
ID: |
58635531 |
Appl.
No.: |
15/096,171 |
Filed: |
April 11, 2016 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20170123158 A1 |
May 4, 2017 |
|
Foreign Application Priority Data
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|
|
|
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Nov 3, 2015 [KR] |
|
|
10-2015-0153970 |
Dec 22, 2015 [KR] |
|
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10-2015-0183554 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B
6/4215 (20130101); G02B 6/4227 (20130101); G02B
6/4208 (20130101); G02B 6/4263 (20130101); G02B
6/2938 (20130101); G02B 6/32 (20130101); G02B
6/4221 (20130101); G02B 6/29367 (20130101) |
Current International
Class: |
G02B
6/42 (20060101); G02B 6/293 (20060101); G02B
6/32 (20060101) |
Field of
Search: |
;250/551,216,239 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
|
5439191 |
|
Mar 2014 |
|
JP |
|
10-1047121 |
|
Jul 2011 |
|
KR |
|
10-1144665 |
|
May 2012 |
|
KR |
|
10-1362406 |
|
Feb 2014 |
|
KR |
|
Primary Examiner: Le; Que T
Claims
What is claimed is:
1. A method of packaging a multi-channel optical receiver module,
comprising: installing a first lens on a sub-mount; aligning an
optical block including a plurality of filters on the sub-mount;
installing the aligned optical block on the sub-mount; aligning a
second lens on the sub-mount; installing the aligned second lens on
the sub-mount; and coupling the sub-mount to a TO-stem, wherein the
aligning of the optical block transmits light incident through the
first lens to the plurality of filters, transmits light beams
transmitted through the plurality of filters to an object lens,
monitors positions of and intervals between the light beams
transmitted through the object lens using an infrared (IR) camera,
and aligns the optical block so that the intervals between the
light beams transmitted through the plurality of filters are
identical.
2. The method of claim 1, wherein the aligning of the second lens
comprises aligning the second lens so that the light beams
transmitted through the plurality of filters are incident on the
center portion of the second lens.
3. The method of claim 1, wherein the installing of the optical
block on the sub-mount and the installing of the first lens and the
second lens on the sub-mount comprises installing the optical
block, the first lens, and the second lens on the sub-mount using
epoxy.
4. The method of claim 1, wherein the coupling of the sub-mount to
the TO-stem comprises: inserting a head portion of the TO-stem into
a hole penetrating through the sub-mount from one side surface to
the other side surface of the sub-mount; and sealing the hole of
the sub-mount into which the head portion of the TO-stem is
inserted using the epoxy.
5. An optical receiver module package comprising: a TO-stem
including a base, a plurality of optical receiver devices installed
on the base so that intervals between light beams output through
second lens are identical and configured to receive the light beams
having wavelengths different from each other, a head portion formed
on the base to be inserted into and coupled to sub-mount, and one
or more lead pins configured to penetrate through the base; and the
sub-mount including a first lens transmitting light having various
wavelengths which are incident as parallel light beams, an optical
block configured to guide the parallel light beams, a plurality of
filters coupled to the optical block and configured to transmit
only a specific wavelength among the guided parallel light beams
and reflect the remaining wavelengths, and a second lens aligned to
correspond to each of the plurality of optical receiver devices and
configured to focus the light beams transmitted through the
filters.
6. The optical receiver module package of claim 5, wherein the
first lens is a collimating lens, and the second lens is a coupling
lens.
7. The optical receiver module package of claim 5, wherein one side
surface of the sub-mount is flat, and the other side surface has a
round semicircular shape, and a hole penetrating through the
sub-mount from one end surface to the other end surface of the
sub-mount is formed at the one end surface and the other end
surface of the sub-mount.
8. The optical receiver module package of claim 7, wherein the hole
and the head portion have oval shapes, and the head portion is
inserted into and coupled to the hole.
9. The optical receiver module package of claim 5, wherein the
optical block includes a transparent body, an anti-reflective
layer, and a total reflection layer, and the total reflection layer
totally reflects light reflected by the first filter among the
plurality of filters to the second filter.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority to and the benefit of Korean
Patent Application No. 10-2015-0153970, filed on Nov. 3, 2015 and
Korean Patent Application No. 10-2015-0183554, filed on Dec. 22,
2015 and the disclosure of which is incorporated herein by
reference in its entirety.
BACKGROUND
1. Field of the Invention
The present invention relates to a method of packaging a
multi-channel optical receiver module and a package of the
same.
2. Discussion of Related Art
A method of transmitting optical signals having wavelengths
different from each other to one optical fiber by performing a
wavelength division multiplexing (WDM) on the optical signals is
being used as technology for transmitting high-quality and
large-capacity data traffic. The WDM method is an optical
multiplexing method of transmitting various wavelength bands
simultaneously, can transmit a variety of transmission information
through one optical fiber, and has a transmission capacity which is
equal to or more than 40 Gbps.
Meanwhile, the WDM method may be divided into a coarse WDM (CWDM)
and a dense WDM (DWDM). In the case of the CWDM has a large
wavelength interval of tens of nanometers (nm), has a low cost as
the number of usable wavelengths is 4 to 8, and is mainly used for
an access network. The DWDM has a wavelength interval of several nm
and is mainly used for a medium and long-range transmission.
While the WDM method has been mainly used for a backbone network,
the WDM method has been also applied to an access loop network and
an Ethernet network.
The CWDM method having four wavelengths is being used as a standard
for the Ethernet, and various methods for implementing a
four-wavelength transmitter optical sub-assembly (TOSA) and a
four-wavelength receiver optical sub-assembly (ROSA) absolutely
needed for the CWDM method are being proposed. In this case, the
TOSA performs a four-channel electrophotic conversion function and
a wavelength multiplexing function, and the ROSA performs a
wavelength demultiplexing function and a four-channel photoelectric
conversion function.
In an optical transceiver for the Ethernet network, miniaturization
and low power consumption of the optical transceiver are needed for
lower power consumption and integration of a data center, and
optical alignment, packaging, reliability of the optical module
embedded in the optical transceiver are very important.
However, conventional arts having various structures are difficult
to miniaturize due to a characteristic of their structures and have
a problem of a great loss according to an optical alignment.
Further, the conventional arts have a problem in that it is
difficult to package, and thus mass production is very
difficult.
Regarding the conventional arts, United States Patent (USP)
Publication No. 2006-0088255 (Title: multi-wavelength optical
transceiver subassembly module) discloses technology in which only
an optical signal having a corresponding wavelength is transmitted
by thin film filters and the optical signals having the remaining
wavelengths are reflected when optical signals having various
wavelengths are incident to the thin film filters aligned in a
pentagon shape through a receptacle.
However, the conventional art has a problem in that it is difficult
to miniaturize due to a characteristic of its structure. Further,
the conventional art has a problem in that a great loss occurs
according to an optical alignment, and it is difficult to package,
and thus mass production is difficult.
SUMMARY OF THE INVENTION
The present invention is directed to a method of packaging a
multi-channel optical receiver module capable of easily
implementing a multi-channel optical module by manually installing
a parallel light lens in a separate sub-mount and aligning an
optical block and a focusing lens in which a filter is installed by
monitoring them using an object lens and an infrared (IR) camera as
well as a package of the same.
The technical objects which embodiments of the present invention
desire to achieve is not limited to the object described above, and
other technical objects may exist.
According to one aspect of the present invention, there is provided
a method of packaging a multi-channel optical receiver module,
including: installing a first lens on a sub-mount; aligning an
optical block including a plurality of filters on the sub-mount;
installing the aligned optical block on the sub-mount; aligning a
second lens on the sub-mount; installing the aligned second lens on
the sub-mount; and coupling the sub-mount to a TO-stem. In this
case, the aligning of the optical block transmits light incident
through the first lens to the plurality of filters, transmit light
beams transmitted through the plurality of filters to an object
lens, monitors positions of and intervals between the light beams
transmitted through the object lens using an infrared (IR) camera,
and aligns the optical block so that the intervals between the
light beams transmitted through the plurality of filters are
identical.
According to another aspect of the present invention, there is
provided an optical receiver module package, including: a TO-stem
including a base, a plurality of optical receiver devices installed
on the base so that intervals between light beams output through
second lens are identical and configured to receive the light beams
having wavelengths different from each other, a head portion formed
on the base to be inserted into and coupled to a sub-mount, and one
or more lead pins configured to penetrate through the base; and the
sub-mount including a first lens transmitting light having various
wavelengths which are incident as parallel light beams, an optical
block configured to guide the parallel light beams, a plurality of
filters coupled to the optical block and configured to transmit
only a specific wavelength among the guided parallel light beams
and reflect the remaining wavelengths, and a second lens aligned to
correspond to each of the plurality of optical receiver devices and
configured to focus the light beams transmitted through the
filters.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and advantages of the present
invention will become more apparent to those of ordinary skill in
the art by describing in detail exemplary embodiments thereof with
reference to the accompanying drawings, in which:
FIG. 1 is a flowchart for describing a method of packaging a
multi-channel optical receiver module according to an embodiment of
the present invention;
FIG. 2 is a diagram illustrating a TO-stem according to an
embodiment of the present invention;
FIG. 3A is a perspective of a sub-mount according to an embodiment
of the present invention;
FIG. 3B is a plan view of a sub-mount according to an embodiment of
the present invention;
FIG. 4 is a diagram illustrating a sub-mount in which first and
second lenses, an optical block, and a filter are installed;
FIG. 5 is a diagram for describing a method of aligning the first
and second lenses;
FIG. 6 is a side view of an optical receiver module package
according to an embodiment of the present invention; and
FIG. 7 is a plan view of an optical receiver module package
according to an embodiment of the present invention.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
Hereinafter, embodiments of the present invention are described in
sufficient detail to enable those of ordinary skill in the art to
embody and practice the present invention. However, the present
invention is not limited to exemplary embodiments which will be
described and can be implemented as various different forms. In
order to describe the present invention clearly, a portion which is
not related to the description is omitted, and similar reference
numerals are given to similar portions in the accompanying drawings
throughout this specification.
Throughout this specification, when one portion is "connected" or
"coupled" to another portion, it may not only mean a case of
directly being connected but also mean a case of being electrically
connected by having an intervening device.
Throughout the specification, when one member is located "on"
another member, it may not only mean a case where one member is in
contact with another member but also mean a case of being connected
by having an intervening member.
Throughout the specification, it will be further understood that
the terms "comprises," "comprising," "includes," and/or
"including," when used herein specify the presence of stated
features, items, steps, operations, elements, and/or components and
do not preclude the presence or addition of one or more other
features, items, steps, operations, elements, components, and/or
groups thereof. The terms "about", "substantially", etc.
representing an extent used throughout this specification are used
to mean a value or a value approximate to the value when a specific
manufacturing material or tolerance is proposed for a mentioned
meaning and in order to help the understanding of the present
invention, the terms are used for preventing an unscrupulous
infringer from wrongfully using a disclosure in which a precise or
absolute value is described. The terms "step.about." or "step
of.about." which are used to indicate a level or extent used
throughout this specification do not mean "step for.about.".
The present invention relates to a method of packaging a
multi-channel optical receiver module and a package of the same
1.
Hereinafter, a method of packaging a multi-channel optical receiver
module according to an embodiment of the present invention will be
described in detail with reference to FIGS. 1 to 5.
FIG. 1 is a flowchart for describing a method of packaging a
multi-channel optical receiver module according to an embodiment of
the present invention. FIG. 2 is a diagram illustrating a TO-stem
100 according to an embodiment of the present invention. FIG. 3 is
a diagram illustrating a sub-mount 200 according to an embodiment
of the present invention. FIG. 4 is a diagram illustrating the
sub-mount 200 in which first and second lenses 210 and 240, an
optical block 220, and filters 230a, 230b, 230c, and 230d are
installed. FIG. 5 is a diagram for describing a method of aligning
the first and second lenses.
First, the method of packaging the multi-channel optical receiver
module according to an embodiment of the present invention may
install the first lens 210 on the sub-mount 200 (S110). In this
case, the first lens 210 may be installed on the sub-mount 200
using ultraviolet (UV) epoxy.
Referring to FIGS. 3 and 4, one side P1 of the sub-mount 200
according to an embodiment of the present invention may be formed
to be flat, and the other side P2 may be formed to have a round
semicircular shape. A hole 201 penetrating through the sub-mount
200 from one end surface to the other end surface of the sub-mount
200 may be formed.
The first lens 210 may be installed on the sub-mount 200. In this
case, the first lens 210 may be located at an upper portion of the
sub-mount 200 and receive light having four wavelengths.
Next, after the plurality of filters 230a, 230b, 230c, and 230d are
installed on one side of the optical block 220 using the UV epoxy,
the optical block 220 including the plurality of filters 230a,
230b, 230c, and 230d may be aligned on the sub-mount 200 (S120). In
this case, a remaining portion excluding a portion having a size
corresponding to the first lens 210 on the other side of the
optical block 220 may be coated to be totally reflected 221.
Preferably, the optical block 220 may receive the light incident
through the first lens 210 which will be described below, and the
filters 230a, 230b, 230c, and 230d may be attached to the optical
block 220 and be aligned in a center portion on the sub-mount 200
so that the light received to the second lens 240 is output.
For this, the optical block 220 may transmit the light incident
through the first lens 210 and transmitted through the plurality of
filters 230a, 230b, 230c, and 230d to the object lens 300.
Positions of the light beams and intervals between the light beams
transmitted to the object lens 300 may be monitored through an
infrared (IR) camera 400, and thus the optical block 220 may be
aligned so that the intervals between the light beams transmitted
through the plurality of filters 230a, 230b, 230c, and 230d are
identical.
Referring to FIGS. 4 and 5, after the first lens 210 is installed
on the sub-mount 200, the light passing through the first lens 210
may be aligned to be incident to the optical block 220. The lights
transmitted through the plurality of filters 230a, 230b, 230c, and
230d may be passed through the object lens 330.
Next, the optical block 220 may be aligned so that the intervals
between the light beams transmitted through the plurality of
filters 230a, 230b, 230c, and 230d are identical by monitoring the
positions of the light beams and the intervals between the light
beams passing through the object lens 300 using the IR camera
400.
In this case, by monitoring through the IR camera 400, the optical
block 220 may be aligned so that the intervals between the light
beams transmitted through the plurality of filters 230a, 230b,
230c, and 230d are identical S1=S2=S3.
That is, the optical block 220 may be aligned so that the intervals
between the light beams monitored through the IR camera 400 are
identical S1=S2=S3, and thus the intervals between the light beams
transmitted through the plurality of filters 230a, 230b, 230c, and
230d may be identical P.sub.1=P.sub.2=P.sub.3.
Next, the optical block 220 aligned as described above may be
installed on the sub-mount 200 (S130).
In this case, the optical block 220 may be installed on the
sub-mount 200 using the UV epoxy.
After installing the optical block 220 on the sub-mount 200, the
second lens 240 configured in an array form may be aligned on the
sub-mount 200 (S140).
In this case, the second lens 240 may be located at a lower portion
of the sub-mount 200 so that the light beams are maximally and
optically coupled to the optical receiver devices 120a, 120b, 120c,
and 120d,and thus receive the light beams transmitted through the
optical block 220 and the filters 230a, 230b, 230c, and 230d.
In addition, the second lens 240 may be aligned using an alignment
jig so that each of the light beams transmitted through the
plurality of filters 230a, 230b, 230c, and 230d is incident to the
center portion of the second lens 240. In this case, in order to
confirm that each of the lights transmitted through the plurality
of filters 230a, 230b, 230c, and 230d is incident to the center of
the second lens 240, the object lens 300 and the IR camera 400 may
be used for aligning the optical block 220 instead of the alignment
jig.
Next, the second lens 240 aligned as described above is installed
on the sub-mount 200 (S140). In this case, the second lens 240 may
be installed on the sub-mount 200 using the UV epoxy like the first
lens 210.
Meanwhile, in an embodiment of the present invention, the first
lens 210 may be a collimating lens, and the second lens 240 may be
a coupling lens.
Next, the sub-mount 200 in which the optical block 220, the first
lens 210, and the second lens 240 are installed may be coupled to
the TO-stem 100 (S150).
The hole 201 may be formed to penetrate through the sub-mount 200
from one end surface to the other end surface of the sub-mount 200.
Also, the TO-stem 100 may include a head portion 130 formed to
correspond to the hole 201 of the sub-mount 200. Accordingly, the
TO-stem 100 and the sub-mount 200 may be coupled by inserting the
head portion 130 of the TO-stem 100 into the hole 201 of the
sub-mount 200.
In this case, the hole 201 of the sub-mount 200 in which the head
portion 130 of the TO-stem 100 is inserted may be sealed without
gaps using epoxy. That is, after inserting the sub-mount 200 in
which the hole 201 is formed into the head portion 130 of the
TO-stem 100, and minutely aligning so that optical coupling
efficiency of the optical receiver devices 120a, 120b, 120c, and
120d is maximized by being the light incident to the first lens
210, the hole 201 may be completely filled and sealed using with
the epoxy. Accordingly, the alignment may not be disturbed even
when an external environment such as a temperature is changed.
Hereinafter, with reference to FIGS. 6 and 7, a multi-channel
optical receiver module package 1 according to an embodiment of the
present invention will be described.
FIG. 6 is a side view of an optical receiver module package 1
according to an embodiment of the present invention. FIG. 7 is a
plan view of the optical receiver module package 1 according to an
embodiment of the present invention.
The optical receiver module package 1 according to an embodiment of
the present invention may include a TO-stem 100 and a sub-mount
200.
The TO-stem 100 may include a base 110, a plurality of optical
receiver devices 120a, 120b, 120c, and 120d, a head portion 130,
and a lead pin 140. The base 110 may be formed to include the
plurality of optical receiver devices 120a, 120b, 120c, and 120d,
the head portion 130, and the lead pin 140, and in an embodiment,
may have a circular shape as shown in FIG. 6.
The plurality of optical receiver devices 120a, 120b, 120c, and
120d receive the lights output through the second lens 240,
respectively, and be aligned on the base 110 so that the intervals
between the light beams output through the second lens 240 are
identical. Also, the plurality of optical receiver devices 120a,
120b, 120c, and 120d receive light beams having wavelengths
different from each other, respectively.
In this case, the number of optical receiver devices 120a, 120b,
120c, and 120d may be the same as the number of wavelengths of the
light incident to the first lens 210. For example, when light
having four wavelengths .lamda..sub.1, .lamda..sub.2,
.lamda..sub.3, .lamda..sub.4is incident, four optical receiver
devices 120a, 120b, 120c, and 120d may be included.
Further, the optical receiver devices 120a, 120b, 120c, and 120d
may receive optical signals having wavelengths different from each
other, respectively. Meanwhile, the optical receiver devices 120a,
120b, 120c, and 120d may be configured as photo diodes receiving
the optical signals having wavelengths .lamda..sub.1,
.lamda..sub.2, .lamda..sub.3, and .lamda..sub.4different from each
other.
The head portion 130 may be formed on the base 110 to be inserted
into and coupled to the sub-mount 200.
In this case, the head portion 130 may be formed to have a shape
corresponding to the shape of the hole 201 to be inserted into the
hole 201 formed in the sub-mount 200. For example, shapes of the
hole 201 and the head portion 130 may be oval shapes.
The lead pin 140 may be formed to penetrate through the base 110 in
the opposite direction of the head portion 130. A wire bonding
operation may be performed between the optical receiver devices
120a, 120b, 120c, and 120d and the lead pin 140 in order to apply
power to the optical receiver devices 120a, 120b, 120c, and
120d.
The sub-mount 200 may include a first lens 210, an optical block
220, a plurality of filters 230a, 230b, 230c, and 230d, and a
second lens 240 configured in an array form.
The first lens 210 may transmit the light having various
wavelengths which is incident to the first lens 210 as parallel
light beams. In this case, in an embodiment of the present
invention, the first lens 210 may be a collimating lens.
The optical block 220 may guide the parallel light beams.
The optical block 220 may include a transparent body, an
anti-reflective layer and a total reflection layer 221. In detail,
the total reflection layer 221 may be formed by being coated on the
remaining portion after excluding a portion having a size
corresponding to the first lens 210 at the other side which is
opposite to the one side of the optical block 220 at which the
plurality of filters 230a, 230b, 230c, and 230d are formed.
The total reflection layer 221 formed as described above may
totally reflect the light, which is reflected by the first filter
among the plurality of filters 230a, 230b, 230c, and 230d, to the
second filter.
Accordingly, the second filter may transmit only a specific
wavelength in the totally reflected light, and reflect light having
the remaining wavelengths to the total reflection layer 221 of the
optical block 220.
The plurality of filters 230a, 230b, 230c, and 230d transmit only a
specific wavelength among the parallel light beams guided by the
optical block 220 and reflect the remaining wavelengths. For this,
the plurality of filters 230a, 230b, 230c, and 230d may have
constant incident angles, respectively, and the light beams
transmitted through the filters 230a, 230b, 230c, and 230d may be
incident to the second lens 240.
For example, the first filter 230a may transmit only the light
having the first wavelength .lamda..sub.1 in the light having
various wavelengths .lamda..sub.1, .lamda..sub.2, .lamda..sub.3 and
.lamda..sub.4 and reflect the light having the remaining
wavelengths .lamda..sub.2, .lamda..sub.3 and .lamda..sub.4. The
second filter 230b may transmit only the light having the second
wavelength .lamda..sub.2 in the totally reflected light, and
reflect the light having the remaining wavelengths .lamda..sub.3
and .lamda..sub.4.
The second lens 240 may be formed in an array form and focus the
light beams transmitted through the filters 230a, 230b, 230c, and
230d. That is, the light beams having wavelengths .lamda..sub.1,
.lamda..sub.2, .lamda..sub.3and .lamda..sub.4 different from each
other transmitted through the filters 230a, 230b, 230c, and 230d,
respectively, may be received and focused. In this case, in an
embodiment of the present invention, the second lens 240 may be a
coupling lens.
One side of the sub-mount 200 including the configuration described
above may be formed to be flat, and the other end of the sub-mount
200 may be formed to have a round semicircular shape. In one end
surface and the other end surface of the sub-mount 200, the hole
201 penetrating through the sub-mount 200 from one end surface to
the other end surface of the sub-mount 200 may be formed.
Further, the head portion 130 formed in the TO-stem 100 may be
formed to have a oval shape that is identical to that of the hole
201. Accordingly, as the head portion 130 may be inserted into the
hole 201 and the hole 201 is sealed with the epoxy, the sub-mount
200 and the TO-stem 100 may be coupled to each other.
Moreover, the shape of the hole 201 of the sub-mount 200 and the
shape of the head portion 130 coupled to the hole 201 are not
limited to above described and may have various shapes including
triangular, square, circular shapes, etc. to facilitate the
coupling.
As described above, operations (S110) to (S150) may be further
divided to have the increased number of operations or be combined
to have the decreased number of operations according to an
implementation example of the present invention. Further, some
operations may be omitted as needed, and the order between the
operations may be changed. Moreover, although omitted, the content
of the multi-channel optical receiver module package 1 already
described with respect to FIGS. 6 and 7 may be applied to the
method of packaging the multi-channel optical receiver module shown
in FIGS. 1 to 5.
According to an embodiment of the present invention described
above, since an optical system and the optical receiver devices
120a, 120b, 120c, and 120d are separately packaged during
packaging, an entire module may not need to be discarded when a
problem occurs in any one portion, and thus a manufacturing cost of
the optical receiver module may be decreased.
Further, when coupling the sub-mount 200 and the TO-stem 100, there
is an advantage in that the alignment may not be disturbed by a
change in an external environment such as temperature since the
hole 201 formed in the sub-mount 200 is sealed with the epoxy.
The above-described embodiments of the present invention are merely
examples, and it will be apparent to those skilled in the art that
various modifications can be made to the above-described
embodiments of the present invention without departing from the
spirit or the scope of the invention. Accordingly, it should be
understood that the embodiments of the present invention are not
intended to limit the scope of the invention but to describe the
invention in all aspects. For example, each component described in
a single form may be implemented in a distributed form, and
similarly, components described in the distributed form may be
implemented in a combined form.
The scope of the present invention is defined by the appended
claims, and it is intended that the present invention covers all
such modifications provided they come within the scope of the
appended claims and their equivalents.
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